Answer:
The
probabilities of success and failure and in 2 : 1.
Let
x is the number of successes, then x has the binomial distribution with n = 6,
Required
probability = P (x 4)
=
P(x = 4) + P(x = 5) + P (x = 6)
=
6C4 q2 p4 + 6C5
q1 p5 + 6C6 q0 p6
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